Gm Global Technolgoy Operations, Inc.

Vinod Chowdary Peddi

Brian A Welchko

Song He

Suresh Gopalakrishnan

Lei Hao

Muhammad Hussain Alvi

Brent S Gagas

Anno Yoo

Bojian Cao

Cheng Gong

Sangyeop Kwak

Le Chang

Yuying Shi

Anmol Aggarwal

Nikhil Deshpande

An electric drive system of a motor vehicle or another battery electric system includes a power inverter module (PIM) connected to a DC power supply, an alternating current (AC) motor connected to the PIM and to a load, and a controller. The motor is a salient machine. Control logic of the controller includes a plant model of the electric drive system. The plant model includes an asymmetric time constant of the motor. The controller selectively modifies the asymmetric time constant via selective and independent operating point-specific manipulation of direct axis (d-axis) and quadrature axis (q-axis) inductance and resistance. The asymmetric time constant is virtually translated in the control logic into a symmetric modified time constant by manipulating or adding virtual inductive and virtual resistive terms independently and per operating point. The controller controls the motor at the operating point using the symmetric modified time constant.

Direct discrete-time current controller for virtually-translated alternating current machine

A system performs a method for operating a vehicle. A cable is attached between an inverter of the vehicle and a motor of the vehicle, the cable having a resistance. The inverter is operated using a first direct current (DC) reference voltage. A processor obtains a current from the motor, calculates a power factor at the inverter, obtains a resistance of the cable, determines a voltage drop between the inverter and the motor from the current, the resistance and the power factor due to a presence of the cable, determines a DC compensation voltage from the voltage drop, and adjusts the first DC reference voltage to a second DC reference voltage using the DC compensation voltage.

Method for compensating alternating current cable loss

A method and apparatus for operating an electric drive unit having an inverter operatively coupled to a polyphase alternating current (AC) motor includes receiving a torque command corresponding to a torque to be produced by the AC motor; receiving a heat level request corresponding to a heat to be generated within the electric drive unit; determining a final current command that is responsive to the torque command and to the heat level request, wherein the current command includes operating in a flux-intensifying region relative to a Maximum Torque Per Ampere (MTPA) curve; and commanding operation of the inverter responsive to the final current command.

Method and apparatus for controlling flux of an electric drive unit for heat generation

A method to suppress tonal noises over a wide speed range in an alternating current electric machine by current injection and voltage injection is provided. The method includes, within a computerized processor, monitoring a position sensor measuring a current electric machine frequency of the electric machine, comparing the current electric machine frequency to a sampling frequency of the position sensor, and operating one of a current injection mode and a voltage injection mode to suppress the tonal noises in the electric machine based upon the comparing.

Method and system to suppress tonal noises over a wide speed range in alternating current electric machines

A propulsion system for a device includes an electric motor configured to generate torque to propel the device. A controller is in communication with the electric motor and is adapted to select at least one harmonic order for a harmonic current command. The controller is adapted to define a plurality of operating regions, including a first operating region, a second operating region and a third operating region, each associated with a respective objective function for generating the harmonic current command. The controller is adapted to operate the harmonic current command with four degrees of freedom by selectively varying a q-axis current magnitude, a d-axis current magnitude, a q-axis phase and a d-axis phase as a function of the torque and a motor speed.

Harmonic current command with four degrees of freedom for electric motor

Presented are motor control systems, vehicles, and methods for generating motor heat while holding an offset motor torque during stationary vehicle operation. A method of operating an AC motor includes a resident or remote vehicle controller receiving a mode request to operate a vehicle in a stationary mode, and a temperature request including the AC motor generating motor heat during the stationary operating mode. The controller determines an offset motor torque to generate the motor heat and hold the AC motor's output member at a select position when operating the vehicle in the stationary mode. Using a DQ transform model of the AC motor, the controller selects multiple dq current trajectories located in respective dq operating quadrants of the DQ transform model based on the offset motor torque. The controller then commands a power inverter to transmit electrical current to the AC motor based on the select dq current trajectories.

Intelligent motor systems and control logic for creating heat with constant offset torque in stationary vehicles

A system in a vehicle includes a current regulator to obtain current commands from a controller based on a torque input and provide voltage commands and an inverter to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC). An electric traction motor provides drive power to a transmission of the vehicle based on injection of the AC from the inverter. A current observer obtains measured input current signals based on the AC for a current control cycle and provides predicted current signals for a next control cycle to the current regulator using a model. The current observer includes a controller to check output of the model against the measured input current signals. The current observer tunes parameters of the controller and the model used to generate the predicted current signals based on the measured input current signals.

Current observer for current regulator of vehicle electric traction motor

An electric drive unit includes a polyphase alternating current (AC) motor, an inverter. A motor controller employs field oriented controls to achieve torque and heat production objectives for the electric drive unit. Additional heat may be generated through inverter operation control.

Method and apparatus for operating an electric drive unit

A system in a vehicle includes a current regulator to obtain current commands from a controller based on a torque input and provide voltage commands and an inverter to use the voltage commands from the current regulator and direct current (DC) supplied by a battery to provide alternating current (AC). The system also includes an electric traction motor to provide drive power to a transmission of the vehicle based on injection of the AC from the inverter. The current regulator adjusts parameters of a transfer function implemented by the current regulator, based on feedback of an input to and an output from the electric traction motor to achieve the AC corresponding with the torque input in no more than two control cycles.

Reduced control cycle current regulator for vehicle electric traction motor

A method for controlling operation of a rotary electric machine includes receiving, via a bandwidth-partitioning harmonic compensation regulator (HCR) of a controller, a commanded torque and rotational speed of the electric machine, and calculating, via the HCR in response to enabling conditions, a dq harmonic compensation current and a dq harmonic compensation voltage for one or more predetermined harmonic orders using the commanded torque and the rotational speed. The harmonic compensation current and voltage cancel torque ripple and current ripple in the one or more predetermined harmonic orders. The method may include injecting an acoustic tone at a predetermined harmonic order. The method additionally includes adding the dq harmonic compensation current and voltage to a dq current and voltage command, respectively, to generate adjusted dq current and voltage commands. The electric machine is then controlled using the adjusted dq current and voltage commands.

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Shelby Charter Township, MI, United States of America

Vinod Chowdary Peddi